单项选择题

A．Boss and Secretary.
B．Wife and Husband.
C．Salesman and customer.
D．Taxi driver and passenger.
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单项选择题
A．Because they get low grades.B．Because they exhaust the reference sources in the library.C．Because they can spend only limited time with the professors.D．Because their teachers do not grade every assignment of them.
A．Because they get low grades.
B．Because they exhaust the reference sources in the library.
C．Because they can spend only limited time with the professors.
D．Because their teachers do not grade every assignment of them.
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